RFR: 8341141: Optimize DirectCodeBuilder [v22]

[Shaojin Wen]

> Some DirectCodeBuilder related optimizations to improve startup and running performance:
> 1. Merge calls, merge writeU1 and writeU2 into writeU3
> 2. Merge calls, merge writeU1 and writeIndex operations
> 3. Directly use writeU1 instead of writeBytecode
> 4. Rewrite the implementation of load and store

Shaojin Wen has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 81 commits:

 - Merge branch 'master' into optim_direct_code_builder_202409
 - Merge remote-tracking branch 'upstream/master' into optim_direct_code_builder_202409
 - Update src/java.base/share/classes/jdk/internal/classfile/impl/AttributeHolder.java
   
   Co-authored-by: Chen Liang <liach at openjdk.org>
 - fix merge error
 - Merge branch 'master' into optim_direct_code_builder_202409
 - optimize DirectClassBuilder::build
 - writeU2U2U2
 - optimization for powerOctal
 - label write clean
 - optimizer for codeSize
 - ... and 71 more: https://git.openjdk.org/jdk/compare/1c3e56c3...d4752d5f

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Changes: https://git.openjdk.org/jdk/pull/21243/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21243&range=21
  Stats: 966 lines in 16 files changed: 585 ins; 119 del; 262 mod
  Patch: https://git.openjdk.org/jdk/pull/21243.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21243/head:pull/21243

PR: https://git.openjdk.org/jdk/pull/21243